Usage:

  Delete UV Sets and rename last uvset

code:

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import maya.cmds as cmds

def DeleteUvSets(newUVSet,sels):
    for mesh in sels:
        set = cmds.polyUVSet(mesh, query=True, allUVSets=1 )
        for i in range(len(set)):
            if i>0:
                 cmds.polyUVSet(mesh, delete=True, uvSet=set[i])
        try:
            cmds.polyUVSet(mesh,rename=True, newUVSet=newUVSet, uvSet= cmds.polyUVSet(mesh, currentLastUVSet=True )[0])
        except:
            pass


sels = cmds.ls(sl=1)
newUVSet='map1'
DeleteUvSets(newUVSet,sels)